<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>欢迎</title>
</head>
<body>
  <%
    if(session.getAttribute("user") == null)
    {
    	out.println("<script>alert('请先登陆');window.location.href='login.jsp'</script>");
    	return;
    }
    Object user = session.getAttribute("user");
    out.println("欢迎"+user);
  %>
  <br/>
  <form action="#" method="post">
    <button type="submit" formaction="jspCode/logout.jsp">登出</button>
  </form>
  
</body>
</html>